Improvement in sewing-machines



J. S. MCCURDY.

Sewing Machine. N0. 38,931. I Patented June 16, 1863.

W {I UewimH N PETERS. PhMo-Lilhognpller. Washinghym D, C.

JAMES S.MOOURDY, on BROOKLYN, NEW YORK, Assienoe ro ELIAS sown,

PATENT OFF C JR, OF SAME PLACE.-

Specification forming-part of Letters Patent No. 38,931, dated June '16,1863.

To all whom it may concern:

Be it known that 1, JAMES S. MOGURDY, of Brooklyn, in the county ofKings and State of New York, have invented certain new and usefulImprovements in Sewing- Machines and I do hereby declare that thefollowing is a full, clear, and exact description of-the same, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- I Figure 1 is a front view of a machine with myimprovements. Fig. 2 is an enlarged lefthand end view of the principaloperating portions of the same with the cap of the cylinder and thelooper-driver removed. Fig. 3 is an enlarged view of the inner side ofthe looper. Fig.4 is an edge view of the same. Fig. 5 is a transversesection of the samein the line 00 a: of Fig. 3. Fig. 6 is a perspectiveview of: the same. Figs. 7 and 8 are views of the needle and looper,illustrating the operation of making the stitch.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to single-thread sewing-machiues'making achain-stitch, and to the use in such machines of a revolving detached orindependent looper.

It consists in furnishing such looper with a spring, operating ashereinafter described, to aid in forming the stitch; also, in a certaindevice for confining such looper in its circular raceway.

To enable others skilled in the art to make and use my invention, 1 willproceed to describe its construction and operation.

A is the stand of the machine, made with a cylinder, B, for the supportof the cloth.

(J is the stationary arm. g

Dis the main shaft, running through the center of the cylinder B,working in a bearing in the solid end a of the cylinder and anotherhearing at the opposite end of the stand and furnished with 'aneccentric, K,- or other device for working the reciprocating eye pointedneedle a, two cams, E E, for operating the feed-bar F, and a disk, G,for driving the looper. The needle-bar H may have the necessary motionimparted to it from the eccentric K, or other coutrivance on the mainshaft, by any suitable means.- The feed-bar F is arranged as a lever towork on a fulcrum-pin, b,

.inder.

the feed movement.

' main shaft.

within the cylinder and to feed across the cyl- The cam E operates toraise the feedingeud of the lever F to make it take hold of the cloth,and the cam E operates to produce The feeding end of the lever is causedto descend to liberate the cloth by its own elasticity, and the returnhorizontal movement of the bar is produced by a spring, I, securedwithin the cylinder, the interior of which is reached by drawing oit'the cap J, which covers its end, and the sleeve L, which covers a wideslot extending nearly its whole length.

M is the revolving detached orindependent looper, fitted to revolveeasily in a circular groove, 0, formed in the solid end a of thecylinder B, concentric with the said cylinder and This looper is an arcof more than halfa circle, as shown in Figs. 1 and 2, pointed at oneend, 0, and forked at the otherend, d. and has its transverse section ofhalf-round form, as shown in Fig. 5; the rounded portion being inside.On its outer face-that is to say, the face which is toward the mouth ofthe groove e--' there-isformed, not far from its point, a roundedshoulder,f, and its forked end is cut away on the inside of theearc toform a heel, g, beyond which the fork projects. A groove, 1, extendsfrom the fork a short distance along the outer convex side of the arc,and within this groove there is secured a light curved spring, m,whichprojects from the heel and fork, as shown in Figs. 2 and 3. r

h is a thin steel plate of the form of a ring, with about one-sixth ofits circumference cut out, as shown at y y in Fig. 2,-having its eX-ternal diameter the same as that of the cyliu-' der B and its internaldiamter somewhat smallor than the diameter of the outer circle of thegroove e. This plate has near its extremities two small holes, which fitto two small pins,t' 23,

secured in the end of the cylinder to keepitin position to'confinethelooper within the groove 0. The said plate is held up to its place bythe disk G, which drives the looper. This disk is furnished with apin,j, which protrudes from its inner side to act against the heel g ofthe looper for the purpose of driving the latter in sewing, and the saiddisk is furnished with a second pin, it, to act against the shoulderf ofthe looper to turn the latterbackward whenever necessary. Thelooper-driving disk G is put on the shaft D after the looper and platehare put in their places. and is secured to the shaft by a pin, p,passing through its hub and through the shaft, and when thus secured itkeeps both the plate It and the looper in place. The plate h keeps thelooper out of contact with the disk, and the opening 3 y in the saidplate ali'ords ample room for the loops to pass from between the diskand the looper.

q is the steel needle-plate, secured to the cylinder over an openingprovided in the upper part of the same opposite the opening y y in theplate h. The movable cap J of the cylin- (leI covers up thelooper-driving disk and the plate h.

The needle nis not situated directly over the axis of the looper-shaft,but a little in front of it, and a groove, 'r, is provided for itsreception in the solid head a of the cylinder.

The operation of the machineis as follows: When motion is communicatedto the main shaft the looperrevolvesuninterruptedly in the direction ofthe arrow shown on it in Fig.2, making one revolution for every completemovementof the needle up and down. After the needle has completed itsdescent and com menced to rise the point of the looper enters between itand the thread,as shown in Fig. and the continued rise of the needlecauses the .loop to be formed around the advancing looper, as shown inFig. 7. VVhen'abont twothirds of the length of the looper has passedthrough the loop, as shown in Fig. 7, the neodle completes its ascentand commences descendingagain,thefeed movementof the cloth.

havingin the meantime taken place in the opposite direction to that inwhich the looper passes through the loop. Just as the point of theneedle pa ses through the cloth in its descent the heel g of the looperpasses out of the loop, which then slips onto the fork d, which keeps itspread open laterally, while the curved spring at catches it and drawsit longitudinally forward in the opposite direction to that in which thefeed of the cloth has taken place,

as shownin Fig. 8, and the needle, descending through the groove Z andfork d of the looper, cannot fail to pass through the loop. After thishas been done the continued revolution of the looper draws the springand fork out of the loop, the spring yielding to allow the loop toescape between itand the inner circumference of the groove 0. The loop,alter escaping, is drawn up to the cloth by the continued descent of theneedle to form the next stitch, but the stitch is not completelytightened till a second loop has been taken from the needle by thelooper, and is then tightened by the completion of the next upwardmovement of the needle.

In the above operation it will be understood that the looper passesthrough the'loops of the needle-thread in precisely the same manner as ashuttle passes through the loops of the needle-thread in a shuttlesewing-ma- 1. The spring m, applied to the detached or independentrevolving looper, substantially as and for the purpose herein specified.

2. The plate It, applied in combination with the revolving looper andthe looper-driving disk G, substantially as and for the purpose hereinspecified. p

JAMES S. MGOUBDY.

Witnesses:

M. M. LIVINGSTON, LEWIS A. TUCKER.

